In short, no. Water durability for Moonglow jewelry depends on which item you've purchased and what metal that style is made out of. Our jewelry will not immediately tarnish or turn green/black when it gets wet. Pewter, silver-plated, and stainless steel charms should be fine if briefly exposed to water, but in moderation. Just like anything else, too much exposure to anything will cause harm the item over time. Keep in mind, the pendants are a photograph of the moon, sealed with acrylic covering the photo. The photo could be damaged if water somehow seeps in between the metal exterior of the pedant and the acrylic coating reaching the photo. This is not very likely, but extended or excessive exposure to water increases this risk of damage. The water durability for chains also depends on their metal type. Pewter is not recommended to water exposure. Sterling silver and rhodium coated chains should be fine if moderately exposed to water, but again, in moderation and keeping them clean with appropriate cleaner is also suggested.